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Update error handling in socks proxy

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pull/27/head
V2Ray 9 years ago
parent 8c682d32e6
commit d77ba76ccf
5 changed files with 92 additions and 50 deletions
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30
common/errors/errors.go
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@ -87,3 +87,33 @@ func NewIPFormatError(ip []byte) IPFormatError {
func (err IPFormatError) Error() string {
return fmt.Sprintf("%sInvalid IP %v", err.Prefix(), err.IP)
}
type ConfigurationError struct {
ErrorCode
}
var configurationErrorInstance = ConfigurationError{ErrorCode: 5}
func NewConfigurationError() ConfigurationError {
return configurationErrorInstance
}
func (r ConfigurationError) Error() string {
return r.Prefix() + "Invalid configuration."
}
type InvalidOperationError struct {
ErrorCode
Operation string
}
func NewInvalidOperationError(operation string) InvalidOperationError {
return InvalidOperationError{
ErrorCode: 6,
Operation: operation,
}
}
func (r InvalidOperationError) Error() string {
return r.Prefix() + "Invalid operation: " + r.Operation
}

28
proxy/socks/protocol/socks.go
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@ -86,12 +86,6 @@ type Socks5AuthenticationResponse struct {
authMethod byte
}
type Socks4AuthenticationResponse struct {
result byte
port uint16
ip []byte
}
func NewAuthenticationResponse(authMethod byte) *Socks5AuthenticationResponse {
return &Socks5AuthenticationResponse{
version: socksVersion,
@ -99,29 +93,11 @@ func NewAuthenticationResponse(authMethod byte) *Socks5AuthenticationResponse {
}
}
func NewSocks4AuthenticationResponse(result byte, port uint16, ip []byte) *Socks4AuthenticationResponse {
return &Socks4AuthenticationResponse{
result: result,
port: port,
ip: ip,
}
}
func WriteAuthentication(writer io.Writer, r *Socks5AuthenticationResponse) error {
_, err := writer.Write([]byte{r.version, r.authMethod})
return err
}
func WriteSocks4AuthenticationResponse(writer io.Writer, r *Socks4AuthenticationResponse) error {
buffer := make([]byte, 8)
// buffer[0] is always 0
buffer[1] = r.result
binary.BigEndian.PutUint16(buffer[2:4], r.port)
copy(buffer[4:], r.ip)
_, err := writer.Write(buffer)
return err
}
type Socks5UserPassRequest struct {
version byte
username string
@ -132,6 +108,10 @@ func (request Socks5UserPassRequest) IsValid(username string, password string) b
return request.username == username && request.password == password
}
func (request Socks5UserPassRequest) AuthDetail() string {
return request.username + ":" + request.password
}
func ReadUserPassRequest(reader io.Reader) (request Socks5UserPassRequest, err error) {
buffer := make([]byte, 256)
_, err = reader.Read(buffer[0:2])

25
proxy/socks/protocol/socks4.go
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@ -27,3 +27,28 @@ type Socks4AuthenticationRequest struct {
Port uint16
IP [4]byte
}
type Socks4AuthenticationResponse struct {
result byte
port uint16
ip []byte
}
func NewSocks4AuthenticationResponse(result byte, port uint16, ip []byte) *Socks4AuthenticationResponse {
return &Socks4AuthenticationResponse{
result: result,
port: port,
ip: ip,
}
}
func (r *Socks4AuthenticationResponse) ToBytes(buffer []byte) []byte {
if buffer == nil {
buffer = make([]byte, 8)
}
buffer[1] = r.result
buffer[2] = byte(r.port >> 8)
buffer[3] = byte(r.port)
copy(buffer[4:], r.ip)
return buffer
}

47
proxy/socks/socks.go
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@ -1,8 +1,6 @@
package socks
import (
_ "bufio"
e2 "errors"
"io"
"net"
"strconv"
@ -15,12 +13,6 @@ import (
"github.com/v2ray/v2ray-core/proxy/socks/protocol"
)
var (
ErrorAuthenticationFailed = e2.New("None of the authentication methods is allowed.")
ErrorCommandNotSupported = e2.New("Client requested an unsupported command.")
ErrorInvalidUser = e2.New("Invalid username or password.")
)
// SocksServer is a SOCKS 5 proxy server
type SocksServer struct {
accepting bool
@ -31,7 +23,8 @@ type SocksServer struct {
func NewSocksServer(vp *core.Point, rawConfig []byte) *SocksServer {
config, err := loadConfig(rawConfig)
if err != nil {
panic(log.Error("Unable to load socks config: %v", err))
log.Error("Unable to load socks config: %v", err)
panic(errors.NewConfigurationError())
}
return &SocksServer{
vPoint: vp,
@ -42,10 +35,9 @@ func NewSocksServer(vp *core.Point, rawConfig []byte) *SocksServer {
func (server *SocksServer) Listen(port uint16) error {
listener, err := net.Listen("tcp", ":"+strconv.Itoa(int(port)))
if err != nil {
log.Error("Error on listening port %d: %v", port, err)
log.Error("Socks failed to listen on port %d: %v", port, err)
return err
}
log.Debug("Working on tcp:%d", port)
server.accepting = true
go server.AcceptConnections(listener)
return nil
@ -55,7 +47,8 @@ func (server *SocksServer) AcceptConnections(listener net.Listener) {
for server.accepting {
connection, err := listener.Accept()
if err != nil {
log.Error("Error on accepting socks connection: %v", err)
log.Error("Socks failed to accept new connection %v", err)
return
}
go server.HandleConnection(connection)
}
@ -68,7 +61,7 @@ func (server *SocksServer) HandleConnection(connection net.Conn) error {
auth, auth4, err := protocol.ReadAuthentication(reader)
if err != nil && !errors.HasCode(err, 1000) {
log.Error("Error on reading authentication: %v", err)
log.Error("Socks failed to read authentication: %v", err)
return err
}
@ -81,10 +74,10 @@ func (server *SocksServer) HandleConnection(connection net.Conn) error {
result = protocol.Socks4RequestRejected
}
socks4Response := protocol.NewSocks4AuthenticationResponse(result, auth4.Port, auth4.IP[:])
protocol.WriteSocks4AuthenticationResponse(connection, socks4Response)
connection.Write(socks4Response.ToBytes(nil))
if result == protocol.Socks4RequestRejected {
return ErrorCommandNotSupported
return errors.NewInvalidOperationError("Socks4 command " + strconv.Itoa(int(auth4.Command)))
}
dest = v2net.NewTCPDestination(v2net.IPAddress(auth4.IP[:], auth4.Port))
@ -98,23 +91,23 @@ func (server *SocksServer) HandleConnection(connection net.Conn) error {
authResponse := protocol.NewAuthenticationResponse(protocol.AuthNoMatchingMethod)
err = protocol.WriteAuthentication(connection, authResponse)
if err != nil {
log.Error("Error on socksio write authentication: %v", err)
log.Error("Socks failed to write authentication: %v", err)
return err
}
log.Warning("Client doesn't support allowed any auth methods.")
return ErrorAuthenticationFailed
log.Warning("Socks client doesn't support allowed any auth methods.")
return errors.NewInvalidOperationError("Unsupported auth methods.")
}
authResponse := protocol.NewAuthenticationResponse(expectedAuthMethod)
err = protocol.WriteAuthentication(connection, authResponse)
if err != nil {
log.Error("Error on socksio write authentication: %v", err)
log.Error("Socks failed to write authentication: %v", err)
return err
}
if server.config.AuthMethod == JsonAuthMethodUserPass {
upRequest, err := protocol.ReadUserPassRequest(reader)
if err != nil {
log.Error("Failed to read username and password: %v", err)
log.Error("Socks failed to read username and password: %v", err)
return err
}
status := byte(0)
@ -124,17 +117,19 @@ func (server *SocksServer) HandleConnection(connection net.Conn) error {
upResponse := protocol.NewSocks5UserPassResponse(status)
err = protocol.WriteUserPassResponse(connection, upResponse)
if err != nil {
log.Error("Error on socksio write user pass response: %v", err)
log.Error("Socks failed to write user pass response: %v", err)
return err
}
if status != byte(0) {
return ErrorInvalidUser
err = errors.NewAuthenticationError(upRequest.AuthDetail())
log.Warning(err.Error())
return err
}
}
request, err := protocol.ReadRequest(reader)
if err != nil {
log.Error("Error on reading socks request: %v", err)
log.Error("Socks failed to read request: %v", err)
return err
}
@ -145,11 +140,11 @@ func (server *SocksServer) HandleConnection(connection net.Conn) error {
response.Error = protocol.ErrorCommandNotSupported
err = protocol.WriteResponse(connection, response)
if err != nil {
log.Error("Error on socksio write response: %v", err)
log.Error("Socks failed to write response: %v", err)
return err
}
log.Warning("Unsupported socks command %d", request.Command)
return ErrorCommandNotSupported
return errors.NewInvalidOperationError("Socks command " + strconv.Itoa(int(request.Command)))
}
response.Error = protocol.ErrorSuccess
@ -165,7 +160,7 @@ func (server *SocksServer) HandleConnection(connection net.Conn) error {
}
err = protocol.WriteResponse(connection, response)
if err != nil {
log.Error("Error on socksio write response: %v", err)
log.Error("Socks failed to write response: %v", err)
return err
}

12
spec/errors.md
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@ -23,3 +23,15 @@
* 原因：不正确的 IP 地址
* 解决：请检查客户端软件，如浏览器的配置
## 0x0005 Configuration Error
* 原因：配置文件不能正常读取
* 解决：请检查配置文件是否存在，权限是否合适，内容是否正常
## 0x0006 Invalid Operation Error
* 原因：不正确的操作
## 0x03E8 Socks Version 4
* 原因：客户端使用了 SOCKS 4 协议
* 解决：升级客户端软件

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